Sash latch



Patented May 10, 1927.

WILLIAM s. ammar, or n nnA tn w e s, Ii iners, f As's 'qnoRro A'D'LA'KE eon- .cPANY, a CORPORATION or ILLINOIS.

SASH LATCH.

Application filed May 6,

The invention relates to latches especially adapted for use in connection with the W111- dows of railway cars; and its principal objects are to secure, with simplicity of construction and operation, ample strength for supporting the weight of the sash, this strength being secured in part by the arrangement of elements of the latch.

The invention consists of a latch having a pivoted dog provided with a nose for engaging a keeper, the line of thrust due to the weight ofthe sash being approximately longitudinally through the body of the dog, and an abutment on the sash plate of the latch with which the dog makes contact when ad vanced.

A preferred embodiment of the invention is hereinafter described, and is lllustrated in the accompanying drawings, in which Fig. 1 is a detail elevation of a sash and window casing, and of the improved latch applied thereto, some of the parts being broken away;

Fig. 2 is a sectional detail on the broken line 22 of Fig. 1;

Fig. 3 is a view in plate of the latch;

Fig. 4 is a sectional detail on the line 44 of Fig. 3;

Fig. 5 is a view in perspective of the dog; and

Fig. 6 is a view in perspective of the spring for advancing the dog.

A window sash is shown at 10, and the stile of the casing at 11, the latter being provided with a keeper plate 12 in the runway, having shoulders, as 13, for engagement by the latch dog. The improved latch is applicable to any form of sash, but in the form shown is designed to be secured to the corner of a metal sash having narrow side rails.

The latch comprises a plate 14, which may be attached to the sash in any suitable manperspective of the sash ner, as by means of screws as shown, and a dog 15, pivoted to the plate and having a nose 16 engageable with the shoulders 13 of the keeper. The dog is provided with a stem or finger piece 17, and the plate 14 is provided with a fixed finger piece 18. A shoulder 19, at the upper end of the body of the dog 15, engages an abutment 20, formed on the plate 14, when the nose of the dog is in engagement with the keeper. The abutment 1926. Serial No. 107,067.

20 may be conveniently formed, as shown, as an integral part of the finger piece or rib 18.

The dog 15 is pivoted to'the plate 14 by means of a pin 21, the aperture in the dog being preferably countersunk to receive the head 22 of the pin in order to form a smooth surface. The inner end of the pin 21 is of reduced diameter, as shown at 23, forming a shoulder which rests upon the inner face of the plate 14. The extreme end of the pin being upset, the shoulder is drawn firmly against the plate and the pin thereby secured against turning or other movement. Preferably the inner face of the dog is provided with a segmental flange 24, concentric with the pivot and entering within a complementary recess in the face of the plate 14, as indicated at 25.

A suitable spring, as 26, is provided for normally holding the dog in advanced position. As shown, this spring is coiled about the pivot, one of its ends 27 being seated in an aperture 28 in the plate 14, its other end 29 bearing against an inner wall of the dog.

When the latch is supporting the sash, as shown in Fig. 1, the nose of its dog rests against an upwardly facing shoulder 13 of the keeper, and the shoulder 19 at the opposite end of the body portion of the dog is in engagement with the abutment 20. The weight of the sash is largely borne by the shoulder 19, and the force is transmitted as a thrust directly through the body of the dog upon the shoulder 13, the pivot being largely relieved of the duty of sustaining the load. The shoulder 13 may be so shaped that upward pressure upon the finger piece 17 will readily retract the dog, permitting the raising or lowering of the sash.

The disclosed embodiment of the invention is simple and highly efiicient, but various changes of detail may be made within its scope.

I claim as my invention- 1. A sash latch comprising a sash plate having an approximately horizontal finger rib, and a keeper-engaging dog pivoted to the plate and having a shoulder for engaging therib when the dog is advanced, the point of contact being approximately in the line of thrust when the nose of the dog is in engagement with the keeper.

2. A sash-supporting latch comprising a sash plate having an abutment, and a dog pivoted to the plate and having a nose for engaging a shouldered keeper, and a stop shoulder for engaging the abutment, and point of contact being approximately in the 5 line of thrust due to the Weight of the sash. 3. A sash latch comprising a sash plate having counterbored pivot aperture, a dog having a pivot aperture and a segmental flange concentric therewith for fitting into the counterbore of the sash plate, and a pivot pin setting through the two named apertures.

In testimony whereof I aflix my signature. WILLIAM S. HAMM. 

